Re: Question about atomic commits and "tree locking".

> How does Subversion deal with two commits at the same time?
> If the changesets don't collide, can they proceed at the same
> time?
>
> Yes. If the changes overlap, the second commit will error out.

Wow, I'm impressed.

Most VCS with atomic commits (such as Perforce) don't allows multiple
sets to commit at the same time. They're lined up one after another to
make sure they don't interfere with each other. It's about the only
single threaded activity that takes place in many systems.

--
David Weintraub
qazwart_at_gmail.com
On Mon, Jun 16, 2008 at 3:38 AM, Stephen Butler <sbutler_at_elego.de> wrote:
> Quoting Alfred Perlstein <bright_at_mu.org>:
>
>> Hey guys,
>>
>> How does Subversion deal with checkouts/updates at the same time
>> as a commit in in progress?
>>
>> example:
>> If you are doing a commit, let's say over 5000 files on your
>> file:///path/project/trunk, if someone does a checkout during
>> this time, will they get "locked out" during this commit.  Or
>> does it use some sort of system so that the checkout can happen
>> at the same time, but you get all-or-none?
>
> You get all-or-none.
>
> The new revision created by the commit is not "visible" to the
> checkout command until the commit has successfully completed.
>
>>
>> How does Subversion deal with two commits at the same time?
>> If the changesets don't collide, can they proceed at the same
>> time?
>
> Yes.  If the changes overlap, the second commit will error out.
>
> See the SVN Book for more details on transactions in the repository
> layer:
>
> http://svnbook.red-bean.com/nightly/en/svn.developer.layerlib.html
>
> The second chapter of the "Beautiful Code" book may also be of
> interest to you.
>
> http://beautifulcode.oreillynet.com/
>
> Regards,
> Steve
>
> --
> Stephen Butler | Software Developer
> elego Software Solutions GmbH
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>
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